Timeline of solar astronomy

Timeline of solar astronomy

• 1613 - Galileo Galilei uses sunspot observations to demonstrate the rotation of the Sun\n* 1619 - Johannes Kepler postulates a solar wind to explain the direction of comet tails\n* 1802 - William Hyde Wollaston observes dark lines in the solar spectrum\n* 1814 - Joseph Fraunhofer systematically studies the dark lines in the solar spectrum\n* 1834 - Hermann Helmholtz proposes gravitational contraction as the energy source for the Sun\n* 1843 - Heinrich Schwabe announces his discovery of the sunspot cycle and estimates its period to be about ten years\n* 1852 - Edward Sabine shows that sunspot number is correlated with geomagnetic field variations\n* 1859 - Richard Carrington discovers solar flares\n* 1860 - Gustav Kirchhoff and Robert Bunsen discover that each chemical element has its own distinct set of spectral lines and use this fact to explain the solar dark lines\n* 1861 - Gustav Spörer discovers the variation of sun-spot latitudes during a solar cycle, known as Spörer's law\n* 1863 - Richard Carrington discovers the differential nature of solar rotation\n* 1868 - Pierre-Jules-Cesar Janssen and Norman Lockyer discover an unidentified yellow line in solar prominence spectra and suggest it comes from a new element which they name "helium"\n* 1893 - Edward Maunder discovers the 1645-1715 Maunder sunspot minimum\n* 1904 - Edward Maunder plots the first sunspot "butterfly diagram''\n* 1906 - Karl Schwarzschild explains solar limb darkening\n* 1908 - George Hale discovers the Zeeman splitting of spectral lines from sunspots\n* 1929 - Bernard Lyot invents the coronagraph and observes the corona with an "artifical eclipse."\n* 1942 - J.S. Hey detects solar radio waves\n* 1949 - Herbert Friedman detects solar X-rays\n* 1960 - Robert Leighton, Robert Noyes, and George Simon discover solar five-minute oscillations by observing the Doppler shifts of solar dark lines\n* 1961 - Horace W. Babcock proposes the magnetic coiling sunspot theory\n* 1970 - Roger Ulrich, John Leibacher, and Robert Stein deduce from theoretical solar models that the interior of the Sun could act as a resonant acoustic cavity\n* 1975 - Franz-Ludwig Deubner makes the first accurate measurements of the period and horizontal wavelength of the five-minute solar oscillations

Category:Science timelines